HCS12 datasheet(57/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.4 Transfer and Exchange Instructions

Transfer instructions copy the content of a register or accumulator into

another register or accumulator. Source content is not changed by the

operation. Transfer register to register (TFR) is a universal transfer

instruction, but other mnemonics are accepted for compatibility with the

M68HC11. The transfer A to B (TAB) and transfer B to A (TBA) instructions

affect the N, Z, and V condition code bits in the same way as M68HC11

instructions. The TFR instruction does not affect the condition code bits.

The sign extend 8-bit operand (SEX) instruction is a special case of the

universal transfer instruction that is used to sign extend 8-bit two’s

complement numbers so that they can be used in 16-bit operations. The

8-bit number is copied from accumulator A, accumulator B, or the condition

code register to accumulator D, the X index register, the Y index register, or

the stack pointer. All the bits in the upper byte of the 16-bit result are given

the value of the most-significant bit (MSB) of the 8-bit number.

Exchange instructions exchange the contents of pairs of registers or

accumulators. When the first operand in an EXG instruction is 8-bits and the

second operand is 16 bits, a zero-extend operation is performed on the 8-bit

Section 6. Instruction Glossary contains information concerning other

transfers and exchanges between 8- and 16-bit registers.

Store Instructions

STAA

Store A

(A)

⇒ M

STAB

Store B

(B)

⇒ M

STD

Store D

(A)

⇒ M, (B) ⇒ M + 1

STS

Store SP

(SPH:SPL) ⇒ M : M + 1

STX

Store X

(XH:XL) ⇒ M : M + 1

STY

Store Y

(YH:YL) ⇒ M : M + 1

Table 5-1. Load and Store Instructions (Continued)

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